By mistake, I configured a group library to allow only admins to edit the library and files. While I (as group owner) am still able to synchronize file annotations to the library from desktop, I always receive the error "You can't write to group ... anymore. What would you like to do?" when I add annotations on Android. The dialog gives the option to keep or revert the changes. However, when I select to keep the changes and later change the group permissions, those annotations are still not synchronized, while new annotations are.